This is **NOT** the same tool as evasi0n 1.x which was used to jailbreak iOS 6.x...
In fact this is called evasi0n 7 1.0 which as the name suggests works only on iOS 7.0 upto 7.0.4 for the time being..This installs a **beta** version of Cydia that was not approved by saurik for mass iOS7 usage at the time this (Cydia) was compiled, since no jailbreak was available back when this took place. Things will eventually iron out, in the meantime I would suggest saving SHSH blobs with tools as TinyUmbrella and the likes and waiting for the main tools, such as Cydia, MobileSubstrate and all to get their updates before proceeding..
On a sidenote there appears to be some controversy over an "alternative" Cydia-style app that this installs in chinese-iDevices...I suppose it's up to anyone to comment or suggest, however I'd strongly suggest holding off until the dust settles..